Fig. 5
From: Camera calibration with coplanar conics: a unified explanation and ambiguity analysis
Most of the quasi-separate and quasi-enclosing cases for two conics and their associated lines. a, c, and e depict the quasi-separate ellipses, hyperbolas, and an ellipse and a hyperbola respectively. The dashed conic indicates the position of a half hyperbola and only the other half hyperbola can be seen. b, d, and f depict the quasi-enclosing ellipses, hyperbolas, and an ellipse and a hyperbola respectively